I found this product-
https://www.flap.org/film.htm
Extremely impressed with the above product and thought others might be impressed tooIt is the transparent and reflective characteristics of glass that cause bird collisions. To eliminate this problem one must make glass visible to birds. It is possible to achieve this without sacrificing the main functions of windows, I.e. to allow natural light in and see the exterior environment from within. A unique window film FLAP dubbed CollidEscape which is presently used for commercial and retail advertising on glass will protect birds and allow you to enjoy the great outdoors from inside.
This film adheres to the exterior surface of a window. Thousands of small perforations in this covering allow ample light to pass through the window to the interior, while substantially reducing the window's exterior reflectivity and transparency, the two characteristics that cause birds to collide with windows
Other advantages include solar reflective features, a decrease in ultraviolet radiation, and the opportunity to observe nature up close (such as birds at a feeding station) without being noticed and disturbing the animal�s activities. CollidEscape can also be used as a substitute for window blinds which will provide privacy during the day, or as a canvas for bright images or advertising messages.
I have some windows that I've had to tack streamers to in an attempt to break the reflections. I have put up mini blinds that I keep in the down position on many upper windows, particularly those where birds might see daylight through them from another window in the same room. I no longer clean some of my outer windows because the dirtier the windows, the less likely birds are to try to fly through them. Another trick I learned that is very effective is to leave screens up year round. Really reduces the lifespan of the screens though. I still have several semi circle windows that are posing a problem though and was very excited to find the above product.